Wikipedia:Articles for deletion/PCA applied to yield curves: Difference between revisions
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*'''Delete'''. It's just three graphs. Limited context, this is a dicdef at best. [[User:Ifnord|Ifnord]] 19:11, 24 June 2006 (UTC)
*'''Comment'''. The article does not make any sense to me. What is this "motion" thing? These curves are not wiggly worms, are they, that change shape as you look at them? What is on the horizontal axis of these curves? Isn't that time? So are there two kinds of time, a meta time for seeing how evolution in normal time evolves? And on whose authority does Wikipedia claim that shift, rotation and curvature are the three main movements? Rotation looks like pseudo scientific junk; it does not commute with linear scale transformations and can turn graphs of functions into non-functional graphs. "Curvature" does not appear to mean what [[curvature]] is supposed to mean. --[[User:Lambiam|Lambiam]][[User talk:Lambiam|<small><sup>Talk</sup></small>]] 19:18, 24 June 2006 (UTC)
::''"What is on the horizontal axis of these curves?"''--- exactly! What do the axes mean? That is basically the problem with PCA; statisticians can't tell you what it means to rotate "options price" into "oil production" or whatever. The geometry makes sense because mathematicians can deal with abstract euclidean space, and the euclidean metric happens to be consonant with elementary parametric statistics (e.g. Gaussians), but how is one to interpret a rotation (as in the principle axis theorem) outside the realm of euclidean geometry (i.e. independent of the original meaning of the axes)? ---[[User:Hillman|CH]] 10:10, 26 June 2006 (UTC)
*'''Delete''', limited context, almost nonsensical. --[[User:Coredesat|Coredesat]] 21:06, 24 June 2006 (UTC)
* '''Delete''', per above. [[User:Oleg Alexandrov|Oleg Alexandrov]] ([[User talk:Oleg Alexandrov|talk]]) 02:12, 25 June 2006 (UTC)
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